[nrhk]

I'm not sure I understand. Proof of Work is not the only game in town anymore. It shouldn't take you more than 30 minutes to find that out. Look at the state of bitcoin, it's dying and the alts are finally seeing the light of day (Over the past two months).

[tobltobs]

Please name one of the alternatives which is secure as the "Proof of work", needs less energy for mining and doesn't have high transaction costs.

[nrhk]

Sure, take a look at Raiblocks, NEO, Lisk.